Bloodred can cause diffusing of the colours, making it even more unlikely that you're able to tell them apart than if they were without the Bloodred.
So yes, theoretically some GoldDust Bloodreds could be Ultra Caramel Bloodreds. Depends what the parents were and whether the breeder has found a foolproof method of telling them apart just by looking at them.
I've produced mixed clutches of GoldDusts & Ultra Caramels by mating two GoldDusts (major mistake). I couldn't tell them apart and when I asked on here, I was told that it wasn't possible visually. I was told that the only way to be certain is with breeding trials as adults.